sqlserver的触发器练习实例

https://www.cnblogs.com/julinhuitianxia/p/6823011.html

https://www.cnblogs.com/xinlj/p/5138974.html

触发器要实现的功能：

（1）获取对表Table1数据操做操做类型（insert、delete或update）。

（2）将表修改后的数据保存到表Table2（该表结构与Table1表结构相似）。

例如：

1>向表Table1添加数据1，表保存后，将数据1添加到表Table2，并将操做类型：insert，保存到表Table2的ChangeType列。

2>修改表Table1，将数据1改为数据2，表保存后，将数据2添加到表Table2，并将操做类型：update，保存到表Table2的ChangeType列。

3>删除表Table1数据1，表保存后，将数据2添加到表Table2，并将操做类型：delete，保存到表Table2的ChangeType列。

表结构：

（1）表Table1

CREATE TABLE Table1( [ID] [BIGINT] IDENTITY(1,1) NOT NULL, [Name] [NVARCHAR](20) NULL, [Sex] [NVARCHAR](2) NULL, [Address] [NVARCHAR](50) NULL, [Age] [INT] NULL, [Birthday] [DATE] NULL ) ON [PRIMARY]

（2）表Table2

CREATE TABLE Table2( [ID] [BIGINT] NOT NULL, [Name] [NVARCHAR](20) NULL, [Sex] [NVARCHAR](2) NULL, [Address] [NVARCHAR](50) NULL, [Age] [INT] NULL, [Birthday] [DATE] NULL, [ChangeType] [NVARCHAR](50) NOT NULL ) ON [PRIMARY]

 

触发器Tri_Table1

CREATE  TRIGGER [Triger_Table1] ON [Table1]
    --After触发器，对表进行insert、delete、update后触发
    AFTER INSERT, DELETE, UPDATE 
AS
    BEGIN
        BEGIN TRY BEGIN TRAN; DECLARE @maxID NVARCHAR(50) , @inserted INT , @deleted INT , @ChangeType NVARCHAR(20); SELECT  @inserted = COUNT(1) FROM Inserted; SELECT  @deleted = COUNT(1) FROM Deleted; --判断对表Table1的操做类型
            IF @inserted > 0
                AND @deleted = 0
                BEGIN 
                    SET @ChangeType = 'INSERT'; END; ELSE
                IF @inserted > 0
                    AND @deleted > 0
                    BEGIN 
                        SET @ChangeType = 'UPDATE'; END; ELSE
                    IF @inserted = 0
                        AND @deleted > 0
                        BEGIN 
                            SET @ChangeType = 'DELETE'; END; IF @ChangeType = 'DELETE'
                BEGIN
                    SELECT  @maxID = ID FROM Deleted; --若是对Table1同一条数据，进行屡次操做，则Table2只保存最新数据 
                    IF EXISTS ( SELECT  COUNT(1) FROM Table2 WHERE   ID = @maxID ) BEGIN 
                            DELETE  FROM Table2 WHERE   ID = @maxID; END; INSERT  INTO Table2 ( ID, Name, Sex, Address, Age, Birthday, ChangeType ) SELECT ID, Name, Sex, Address, Age, Birthday, @ChangeType AS ChangeType FROM Deleted; END; ELSE
                BEGIN
                    SELECT  @maxID = ID FROM Inserted; IF EXISTS ( SELECT  COUNT(1) FROM Table2 WHERE   ID = @maxID ) BEGIN 
                            DELETE  FROM Table2 WHERE   ID = @maxID; END; INSERT  INTO Table2 ( ID, Name, Sex, Address, Age, Birthday, ChangeType ) SELECT ID, Name, Sex, Address, Age, Birthday, @ChangeType AS ChangeType FROM Inserted END; COMMIT TRAN; END TRY BEGIN CATCH IF XACT_STATE() = -1
                ROLLBACK TRAN; END CATCH; END;

 

 

 

 

 

下面是只有新增和修改的

CREATE TABLE Table1( [ID] [BIGINT] IDENTITY(1,1) NOT NULL, [Name] [NVARCHAR](20) NULL, [Sex] [NVARCHAR](2) NULL, [Address] [NVARCHAR](50) NULL, [Age] [INT] NULL, [Birthday] [DATE] NULL ) ON [PRIMARY]

CREATE TABLE Table2( [ID] [BIGINT] IDENTITY(1,1) NOT NULL, [Name] [NVARCHAR](20) NULL, [Sex] [NVARCHAR](2) NULL, [Address] [NVARCHAR](50) NULL, [Age] [INT] NULL, [Birthday] [DATE] NULL, [ChangeType] [NVARCHAR](50) NOT NULL ) ON [PRIMARY]

 

CREATE  TRIGGER [Triger_Table1] ON [Table1]
    --After触发器，对表进行insert、delete、update后触发
    AFTER INSERT, UPDATE 
AS
    BEGIN
        BEGIN TRY BEGIN TRAN; DECLARE @maxID NVARCHAR(50) , @inserted INT , @deleted INT , @ChangeType NVARCHAR(20); SELECT  @inserted = COUNT(1) FROM Inserted; SELECT  @deleted = COUNT(1) FROM Deleted; --判断对表Table1的操做类型
            IF @inserted > 0
                AND @deleted = 0
                BEGIN 
                    SET @ChangeType = 'INSERT'; END; ELSE
                IF @inserted > 0
                    AND @deleted > 0
                    BEGIN 
                        SET @ChangeType = 'UPDATE'; END; BEGIN                         
                    INSERT  INTO Table2 ( Name, Sex, Address, Age, Birthday, ChangeType ) SELECT Name, Sex, Address, Age, Birthday, @ChangeType AS ChangeType FROM Inserted END; COMMIT TRAN; END TRY BEGIN CATCH IF XACT_STATE() = -1
                ROLLBACK TRAN; END CATCH; END;